How did the United States mobilize 12 million military service members by 1945? by using a combination of required registration for the draft and appealing to Americans’ patriotic duty to volunteer by conscripting all American men between the ages of 18 and 45 to serve in the Army, Navy, or Marines by using financial incentives to encourage young men to volunteer in exchange for generous bonuses after the war by allowing women to serve in all military roles to encourage greater overall enlistment numbers